Have a look at this machine. Does it look familiar?
Here are a few specs. I think there are some good starting points here for an inexpensive CNC project.
HOMEMADE CNC ROUTER
Constructed of extremely durable HDPE (High Density Polyethylene)
X & Y axis are mounted on hardened 1.00″ linear shaft with super-oilite self-lubricating bronze bushings
Z axis are mounted on hardened 0.75″ linear shaft with super-oilite self-lubricating bronze bushings
All axis moves with 1/2-10 Acme Lead Screws
24 t-nuts threaded steel (1/4-20) inserts in the table for convenient fastening of the workpiece.
Router mounts included (see my ebay store and send me a e-mail for your choise).
7 day satisfaction guarantee. Just return undamaged for a full refund (minus shipping)
If you want to upgrade, this model allows you to change the sleeves blocks for real bearings block (TWA12UU, TWA16UU, SPB12, SPB16 etc).
Travels: X-16.0 Y-24.0 Z-4.0 (Inches)
Table size: 32 x 23.5 (inches)
color may be different depending on the availability
What is needed (not included)
3 stepper motor nema 23
Stepper motor driver
Router or dremel (or other option)
A personal computer which meets Mach-3’s minimum requirements